[1] Univ KwaZulu Natal, Nelson R Mandela Sch Med, Dept Neurol, Durban, South Africa
[2] Greys Hosp, Dept Neurol, Pietermaritzburg, South Africa
[3] Univ KwaZulu Natal, Dept Neurol, Durban, South Africa
[4] Univ KwaZulu Natal, Dept Neurol, Inkosi Albert Luthuli Cent Hosp, Durban, South Africa
[5] Inkosi Albert Luthuli Cent Hosp, NHLS, Dept Anat Pathol, Durban, South Africa
[6] Tygerberg Hosp, Immunol Unit, NHLS Tygerberg, Tygerberg, South Africa